A Stanford computer science professor and mentor to Google's founders who drowned in his Atherton pool had a blood-alcohol content more than three times the level that constitutes drunken driving, authorities said Thursday.

Motwani invested in technology startups and was a mentor to a number of entrepreneurs, including the founders of Google.

On his blog, Google co-founder and Stanford graduate Sergey Brin wrote of Motwani, "Officially, Rajeev was not my adviser, and yet he played just as big a role in my research, education and professional development. In addition to being a brilliant computer scientist, Rajeev was a very kind and amicable person and his door was always open."